Johnson, A. (1997). Flow is genet and ramet blind: Consequences of individual, group and colony morphology on filter feeding and flow. Proceedings of the 8th International Coral Reef Symposium 2: 1093-1096.

Johnson, A.S., Ellers, O. (2006) A new fluorochrome-based identification tag for sea urchins for use in a hatchery and lease-site aquaculture. Northeast Aquaculture Conference and Exposition. Mystic, Connecticut. December, 2006.

Ellers, O., Johnson, A.S. (2006). Temperature determines size and time-to-size in urchins: calibration of size-temperature effects in marine ectotherms. International Echinoderm Conference, University of New Hampshire, August 2006.

Johnson, A.S., Ellers, O., *Wright, M., *Selden, R, *Stranges, B. (2006). Is there an oxygen-limited lag phase in early growth in sea urchins, Strongylocentrotus droebachiensis? International Echinoderm Conference, University of New Hampshire, August 2006.

This demonstration allows the user to manipulate the value of physically important variables in the system and the output is the motion of a pendulum as defined by the angular position of the pendulum bob relative to vertical.

The damped pendulum model is programmed in Mathematica by Olaf Ellers and is based on the math published by others in the following paper: